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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7a8d212e4996ac4bb28a38544f20dd8f044fefcbad536cfde3d90a6c6b325b3a' 
  AND token = 'bIe0+h4FivbxhekLoILQDEWbiO5YwhsqSmbL9mPAVCg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}